#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
#include<cstdio>

using namespace std;

int main()
{
    long long t, v;
    double h;
    cin >> t >> v;
    h = (t * v) * (1 / 12.0);
    printf("%.3lf", h);
    return 0;
}